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ITGlossary · Communication and monitoring
NUT (Network UPS Tools)
Open-source software that reads the UPS status and shares it over the network, so that several servers and NAS devices can shut down in a coordinated way.
Technical level:Advanced
Network UPS Tools works on a server–client model. One computer, NAS or small single-board computer connects to the UPS via USB, serial port or network and runs the appropriate driver together with the upsd service. The other computers run upsmon, query the status over the network and shut down when the battery is running out.
It supports a very large number of UPS models, often through the generic usbhid-ups driver, and is built into many NAS devices, firewalls and virtualisation platforms, so a setting in a menu is often all it takes.
A common mistake is for the computer connected to the UPS to shut down first. The NUT server must shut down last, after notifying all its clients.
Related terms
- Shutdown SoftwareSoftware that talks to the UPS and automatically shuts down servers and computers safely before the battery runs out.
- RS-485Differential serial interface over a wire pair that links many devices on one bus over long distances, usually with the Modbus RTU protocol.
- SNMPA standard network protocol used to monitor and control devices like UPS systems over a network.
- Wake-on-LAN (WoL)Network card feature that starts a powered-off computer or server when it receives a special network packet, the magic packet.
- Ethernet Port (RJ45)The UPS's Ethernet network port, through which it can be monitored and controlled from any computer on the network via a browser, SNMP or shutdown software.
- Remote MonitoringThe ability to observe and manage UPS performance over a network from another location.